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參數(shù)資料
| 型號(hào)： | AD7568BSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 12BIT OCTAL LC2MOS 44MQFP |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Fundamentals DAC Architectures |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 設(shè)置時(shí)間： | 500ns |
| 位數(shù)： | 12 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 8 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 17.5mW |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-QFP |
| 供應(yīng)商設(shè)備封裝： | 44-MQFP（10x10） |
| 包裝： | 托盤 |
| 輸出數(shù)目和類型： | 16 電流，單極；16 電流，雙極 |
| 采樣率（每秒）： | 2M |
| 產(chǎn)品目錄頁面： | 785 (CN2011-ZH PDF) |
AD7568
–9–
Current Mode Circuit
In the current mode circuit of Figure 17, IOUT2, and hence
IOUT1, is biased positive by an amount VBIAS. For the circuit to
operate correctly, the DAC ladder termination resistor must be
connected internally to IOUT2. This is the case with the AD7568.
The output voltage is given by:
VOUT = D
RFB
RDAC
V BIAS V IN
()
{}+V
BIAS
As D varies from 0 to 4095/4096, the output voltage varies from
VOUT = VBIAS to VOUT = 2 VBIAS – VIN. VBIAS should be a low
impedance source capable of sinking and sourcing all possible
variations in current at the IOUT2 terminal without any
problems.
Voltage Mode Circuit
Figure 18 shows DAC A of the AD7568 operating in the
voltage-switching mode. The reference voltage, VIN is applied to
the IOUT1 pin, IOUT2 is connected to AGND and the output volt-
age is available at the VREF terminal. In this configuration, a
positive reference voltage results in a positive output voltage
making single supply operation possible. The output from the
DAC is a voltage at a constant impedance (the DAC ladder re-
sistance). Thus, an op amp is necessary to buffer the output
voltage. The reference voltage input no longer sees a constant
input impedance, but one which varies with code. So, the volt-
age input should be driven from a low impedance source.
It is important to note that VIN is limited to low voltages be-
cause the switches in the DAC no longer have the same source-
drain voltage. As a result, their on-resistance differs and this
degrades the integral linearity of the DAC. Also, VIN must not
go negative by more than 0.3 volts or an internal diode will turn
on, causing possible damage to the device. This means that the
full-range multiplying capability of the DAC is lost.
DAC A
A1
I
A
OUT1
I
A
OUT2
AD7568
V
OUT
R
A
FB
V
A
REF
V
IN
NOTES
1) ONLY ONE DAC IS SHOWN FOR CLARITY.
2) DIGITAL INPUT CONNECTIONS ARE OMITTED.
3) C1 PHASE COMPENSATION (5–15pF) MAY BE
REQUIRED WHEN USING HIGH SPEED AMPLIFIER, A1.
R1
R2
Figure 18. Single Supply Voltage Switching
Mode Operation
APPLICATIONS
Programmable State Variable Filter
The AD7568 with its multiplying capability and fast settling
time is ideal for many types of signal conditioning applications.
The circuit of Figure 19 shows its use in a state variable filter
design. This type of filter has three outputs: low pass, high pass
and bandpass. The particular version shown in Figure 19 uses
one half of an AD7568 to control the critical parameters f0, Q
and A0. Instead of several fixed resistors, the circuit uses the
DAC equivalent resistances as circuit elements. Thus, R1 in
Figure 19 is controlled by the 12-bit digital word loaded to
DAC A of the AD7568. This is also the case with R2, R3 and
R4. The fixed resistor R5 is the feedback resistor, RFBB.
DAC Equivalent Resistance, REQ = (RLADDER
4096)/N
where:
RLADDER is the DAC ladder resistance.
N is the DAC Digital Code in Decimal (0 < N < 4096).
DAC A
(R1)
DAC B
(R2)
1/2 x AD7568
A1
R8 30k
HIGH
PASS
OUTPUT
DAC C
(R3)
I
A
OUT1
I
C
OUT1
R
B
FB
V
B
REF
V
IN
I
B
OUT1
V
C
REF
DAC D
(R4)
C3 10pF
C1 1000pF
R7 30k
C1 1000pF
LOW
PASS
OUTPUT
BAND
PASS
OUTPUT
V
A
REF
I
C
OUT2
I
B
OUT2
I
A
OUT2
I
D
OUT2
V
D
REF
I
D
OUT1
A2
A3
R6
10k
NOTES
1. A1, A2, A3, A4: 1/4 x AD713
2. DIGITAL INPUT CONNECTIONS ARE OMITTED.
3. C3 IS A COMPENSATION CAPACITOR TO ELIMINATE
Q AND GAIN VARIATIONS CAUSED BY AMPLIFIER GAIN
BANDWIDTH LIMITATIONS.
Figure 19. Programmable 2nd Order State Variable Filter
REV. C
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| AD7568BSZ-REEL | 功能描述:IC DAC 12BIT OCTAL LC2MOS 44MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD7569ACHIPS | 功能描述:Analog I/O Interface Die 制造商:analog devices inc. 系列:LC2MOS 包裝:- 零件狀態(tài):上次購買時(shí)間 應(yīng)用:模擬 I/O 接口:總線 電壓 - 電源:4.75 V ~ 5.25 V 封裝/外殼:- 供應(yīng)商器件封裝:模具 安裝類型:表面貼裝 標(biāo)準(zhǔn)包裝:1 |
| AD7569AQ | 功能描述:IC I/O PORT 8BIT ANLG 24-CDIP RoHS:否 類別:集成電路 (IC) >> 接口 - 專用 系列:LC²MOS 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| AD7569BN | 制造商:Analog Devices 功能描述:Data Acquisition System Single ADC Single DAC 8-Bit 24-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:8-BIT CMOS I/O PORT IC - Bulk |
| AD7569BNZ | 功能描述:IC I/O PORT 8BIT ANALOG 24DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:LC²MOS 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
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